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/*
* include/asm-sh/processor.h
*
* Copyright (C) 1999, 2000 Niibe Yutaka
*/
#ifndef __ASM_SH_PROCESSOR_H
#define __ASM_SH_PROCESSOR_H
#include <asm/page.h>
#include <asm/types.h>
#include <linux/threads.h>
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ void *pc; __asm__("mova 1f, %0\n1:":"=z" (pc)); pc; })
/*
* CPU type and hardware bug flags. Kept separately for each CPU.
*/
enum cpu_type {
CPU_SH7708, /* Represents 7707, 7708, 7708S, 7708R, 7709 */
CPU_SH7729, /* Represents 7709A, 7729 */
CPU_SH7750, /* Represents 7750, 7751 */
CPU_ST40STB1,
CPU_SH_NONE
};
struct sh_cpuinfo {
enum cpu_type type;
char hard_math;
unsigned long loops_per_jiffy;
unsigned int cpu_clock, master_clock, bus_clock, module_clock;
#ifdef CONFIG_CPU_SUBTYPE_ST40STB1
unsigned int memory_clock;
#endif
};
extern struct sh_cpuinfo boot_cpu_data;
#define cpu_data (&boot_cpu_data)
#define current_cpu_data boot_cpu_data
/*
* User space process size: 2GB.
*
* Since SH7709 and SH7750 have "area 7", we can't use 0x7c000000--0x7fffffff
*/
#define TASK_SIZE 0x7c000000UL
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE (TASK_SIZE / 3)
/*
* Bit of SR register
*
* FD-bit:
* When it's set, it means the processor doesn't have right to use FPU,
* and it results exception when the floating operation is executed.
*
* IMASK-bit:
* Interrupt level mask
*/
#define SR_FD 0x00008000
#define SR_IMASK 0x000000f0
/*
* FPU structure and data
*/
struct sh_fpu_hard_struct {
unsigned long fp_regs[16];
unsigned long xfp_regs[16];
unsigned long fpscr;
unsigned long fpul;
long status; /* software status information */
};
/* Dummy fpu emulator */
struct sh_fpu_soft_struct {
unsigned long fp_regs[16];
unsigned long xfp_regs[16];
unsigned long fpscr;
unsigned long fpul;
unsigned char lookahead;
unsigned long entry_pc;
};
union sh_fpu_union {
struct sh_fpu_hard_struct hard;
struct sh_fpu_soft_struct soft;
};
struct thread_struct {
unsigned long sp;
unsigned long pc;
unsigned long trap_no, error_code;
unsigned long address;
/* Hardware debugging registers may come here */
/* floating point info */
union sh_fpu_union fpu;
};
#define INIT_THREAD { \
sizeof(init_stack) + (long) &init_stack, /* sp */ \
0, /* pc */ \
0, 0, \
0, \
{{{0,}},} /* fpu state */ \
}
/*
* Do necessary setup to start up a newly executed thread.
*/
#define start_thread(regs, new_pc, new_sp) \
set_fs(USER_DS); \
regs->pr = 0; \
regs->sr = 0; /* User mode. */ \
regs->pc = new_pc; \
regs->regs[15] = new_sp
/* Forward declaration, a strange C thing */
struct task_struct;
struct mm_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/*
* create a kernel thread without removing it from tasklists
*/
extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/*
* Bus types
*/
#define EISA_bus 0
#define EISA_bus__is_a_macro /* for versions in ksyms.c */
#define MCA_bus 0
#define MCA_bus__is_a_macro /* for versions in ksyms.c */
/* Copy and release all segment info associated with a VM */
#define copy_segments(p, mm) do { } while(0)
#define release_segments(mm) do { } while(0)
/*
* FPU lazy state save handling.
*/
static __inline__ void release_fpu(void)
{
unsigned long __dummy;
/* Set FD flag in SR */
__asm__ __volatile__("stc sr, %0\n\t"
"or %1, %0\n\t"
"ldc %0, sr"
: "=&r" (__dummy)
: "r" (SR_FD));
}
static __inline__ void grab_fpu(void)
{
unsigned long __dummy;
/* Clear out FD flag in SR */
__asm__ __volatile__("stc sr, %0\n\t"
"and %1, %0\n\t"
"ldc %0, sr"
: "=&r" (__dummy)
: "r" (~SR_FD));
}
extern void save_fpu(struct task_struct *__tsk);
#define unlazy_fpu(tsk) do { \
if ((tsk)->flags & PF_USEDFPU) { \
grab_fpu(); \
save_fpu(tsk); \
} \
} while (0)
#define clear_fpu(tsk) do { \
if ((tsk)->flags & PF_USEDFPU) \
(tsk)->flags &= ~PF_USEDFPU; \
} while (0)
/* Double presision, NANS as NANS, rounding to nearest, no exceptions */
#define FPSCR_INIT 0x00080000
/*
* Return saved PC of a blocked thread.
*/
static __inline__ unsigned long thread_saved_pc(struct thread_struct *t)
{
return t->pc;
}
extern unsigned long get_wchan(struct task_struct *p);
#define KSTK_EIP(tsk) ((tsk)->thread.pc)
#define KSTK_ESP(tsk) ((tsk)->thread.sp)
#define THREAD_SIZE (2*PAGE_SIZE)
extern struct task_struct * alloc_task_struct(void);
extern void free_task_struct(struct task_struct *);
#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
#define init_task (init_task_union.task)
#define init_stack (init_task_union.stack)
#define cpu_relax() do { } while (0)
#endif /* __ASM_SH_PROCESSOR_H */
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